Samarium Triflate as Mild and Efficient Catalyst for Aza-Diels–Alder Reaction: A Facile Synthesis of<i>cis</i>-Fused Pyrano- and Furanoquinolines
作者:A. Venkat Narsaiah、A. Ramesh Reddy、B. V. Subba Reddy、J. S. Yadav
DOI:10.1080/00397910903161736
日期:2010.5.19
Three-component coupling reactions of aldehydes, amines, and cyclic enol ethers have been carried out in the presence of samarium triflate to afford the corresponding pyrano and furanoquinolines in excellent yields with high endo-selectivity. The reaction conditions are mild and amenable to scale-up.
Phosphomolybdic acid-catalyzed efficient one-pot three-component aza-Diels–Alder reactions under solvent-free conditions: a facile synthesis of trans-fused pyrano- and furanotetrahydroquinolines
furanotetrahydroquinoline derivatives have been synthesized via a one-pot three-component aza-Diels–Alder reaction of aryl imines formed in situ from aromatic amines and arylaldehydes with cyclic enol ethers,such as 3,4-dihydro-2H-pyran and 2,3-dihydrofuran,in the presence of 1 mol % of phosphomolybdic acid undersolvent-freeconditions at room temperature in good to excellent yields.